Doctor Kureha is Drum Island's only doctor, and she's earned the reputation of being a bit of a witch—partly because she actually lives like one (isolated from everyone), but mostly because her bedside manner is absolutely brutal. She'll straight-up hurt patients who don't listen to her, which sounds harsh until you realize it actually works. Beyond the medical credentials, she's got some seriously weird combat ability: she can punch through brick walls several meters thick without breaking a sweat. At nearly 140 years old, she's still in remarkable shape, a living testament to whatever extreme regimen she's been following. She's a legitimate doctor, though, not just some folk healer—it's just that her methods are. unconventional.
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